// 实现这个项目的构建任务

const { src, dest, parallel, series, watch } = require('gulp')

const del = require('del')
const browserSync = require('browser-sync')
const loadPlugins = require('gulp-load-plugins')

const plugins = loadPlugins()
const bs = browserSync.create()

const data = {
  menus: [
    {
      name: 'Home',
      icon: 'aperture',
      link: 'index.html'
    },
    {
      name: 'Features',
      link: 'features.html'
    },
    {
      name: 'About',
      link: 'about.html'
    },
    {
      name: 'Contact',
      link: '#',
      children: [
        {
          name: 'Twitter',
          link: 'https://twitter.com/Yikhan'
        },
        {
          name: 'About',
          link: 'https://weibo.com/Yikhan'
        },
        {
          name: 'divider'
        },
        {
          name: 'About',
          link: 'https://github.com/Yikhan'
        }
      ]
    }
  ],
  pkg: require('./package.json'),
  date: new Date()
}

const clean = () => {
  return del([ 'dist', 'temp' ])
}

const style = () => {
  return src('src/assets/styles/*.scss', { base: 'src' })
    .pipe(plugins.sass({ outputStyle: 'expanded' }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}

const script = () => {
  return src('src/assets/scripts/*.js', { base: 'src' })
    .pipe(
      plugins.eslint({
        rules: {
          'no-alert': 0,
          'no-bitwise': 0,
          'no-eq-null': 0,
          'guard-for-in': 1,
          'no-empty': 1,
          'no-use-before-define': 0,
          'no-obj-calls': 1,
          'no-unused-vars': 0,
          'new-cap': 1,
          'no-shadow': 0,
          'no-invalid-regexp': 1,
          'comma-dangle': 1,
          'no-undef': 1,
          'no-new': 1,
          'no-extra-semi': 1,
          'no-debugger': 1,
          'no-caller': 1,
          'no-unreachable': 1
        },

        globals: [ '$' ],

        envs: [ 'node' ]
      })
    )
    .pipe(plugins.babel({ presets: [ '@babel/preset-env' ] }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}

const page = () => {
  return src('src/**/*.html', { base: 'src' })
    .pipe(plugins.swig({ data, defaults: { cache: false } }))
    .pipe(dest('temp'))
    .pipe(bs.reload({ stream: true }))
}

const image = () => {
  return src('src/assets/images/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const font = () => {
  return src('src/assets/fonts/**', { base: 'src' })
    .pipe(plugins.imagemin())
    .pipe(dest('dist'))
}

const extra = () => {
  return src('public/**', { base: 'public' }).pipe(dest('dist'))
}

const start = () => {
  // 代码文件
  watch('src/assets/styles/*.scss', style)
  watch('src/assets/scripts/*.js', script)
  watch('src/**/*.html', page)
  // 资源文件
  watch(
    [ 'src/assets/images/**', 'src/assets/fonts/**', 'public/**' ],
    bs.reload
  )

  bs.init({
    notify: false,
    port: 2080,
    open: true,
    server: {
      baseDir: [ 'temp', 'src', 'public' ],
      routes: {
        '/node_modules': 'node_modules'
      }
    }
  })
}

const useref = () => {
  return (
    src('temp/**/*.html', { base: 'temp' })
      .pipe(plugins.useref({ searchPath: [ 'temp', '.' ] }))
      // html js css
      .pipe(plugins.if(/\.js$/, plugins.uglify()))
      .pipe(plugins.if(/\.css$/, plugins.cleanCss()))
      .pipe(
        plugins.if(
          /\.html$/,
          plugins.htmlmin({
            collapseWhitespace: true,
            minifyCSS: true,
            minifyJS: true
          })
        )
      )
      .pipe(dest('dist'))
  )
}

const compile = parallel(style, script, page)

// 上线之前执行的任务
const build = series(clean, parallel(compile, image, font, extra), useref)

// 开发编译并打开Broswer
const serve = series(compile, start)

module.exports = {
  clean,
  build,
  start,
  serve
}
